Grinding-wheel chuck



C. E. CADMAN.

GRINDING WHEEL CHUCK.

APPLICATION FILED JULY 19, I920.

Patented Sept. 6,1921.

6 HIIKQ:

UNITED STATES PATENT OFFICE.

GRINDING-WHEEL CHUCK.

Specification of Letters Patent.

Patented Sept. 6, 1921.

Application filed July 19, 1920. Serial No. 397,193.

To allwhom't may concern: 7

Be it known that I, CALVINEJCADMAN, a citizen of the United States,residing at South Beloit, in the county of Winnebago and State ofVVisconsin, have invented certain new and useful Improvements inGrinding-Vheel Chucks, of which the following isa specification. I o

This invention relates in general to grind: ing wheels, and has moreparticular reference to the chuck in which such wheels are mounted. g 7

It has heretofore been customary in mounting these grinding wheels inchuck bodies to retain them in position by holding means which engagethe perimeter of the wheel at spaced intervals only. In suchconstructions, however, the spaced holding means have a tendency to cutinto the surface of the grinding wheel, permitting the wheel toworkloose, and furthermore, such a series of engaging points tended toweaken the wheel and render it liable to split or fracture. j 7

One of the primary purposes of my present invention is to provide aholding chuck for grinding wheels of this character. in which the wheelholding or clamping means shall be so constructed that it will engageand clamp the grinding wheel substantially throughout its entireperiphery, thus obviatingjthe objections above mentioned.-

Another object of my invention is to provide a grinding wheel chuckwhich will be simple in construction, cheap to manufacture, and durablein operation, and one which will securely hold the grinding wheel inposition without danger of its working loose. 1

it further feature of my invention resides in the provision of spacingmeans capable of insertion behind a grinding wheel for the purpose ofprojecting the face of the wheel beyond the chuck after the wheel hasbeen partially worn down.

Other objects and advantages of this invention will be readilyunderstood and appreciated from the following description, whenconsidered in connection with the accompanying drawings.

Referring to the drawings:

Figure 1 is a diametral sectional view of a grinding wheel chuckembodying my invention;

Fig. 2 is a similar view showing the application of my improved spacingring thereto; and

Fig. 3 is a face view partially in section, of the'chuck, shown in Fig.2.

By reference to the drawings, observed that the chuck consists of abody,consisting of a disk 5 and an axial flan e 6 formed around the perimeterof'the disk. This body is provided with the usual central opening 7adapted to accommodate the end of'a shaft upon which the chuck ismounted, and a plurality of sur rounding holes 8 adapted to receive thescrews or bolts. by which the chuck is sccured to its supporting shafThe flange 6 of the body is referably thickened near its margin, asindicated by reference character 9, and this thickened portion isprovided with an internal groove ll adapted to accommodate the clampingring 12. This ring or gib preferably consists of a picceof cold rolledsteel bent into it will be nr 1 ins rily substantially circular form andsprung into position in the groove. The ring, as will be understood, issplit, that is, it is non-continuous, and for the purpose of preventingrotation of the ring within the chuck body. I prefer to equip the bodywith an inwardly projecting stud orpin 13 extendin into the groove 11between the opposed ends lat of the ring. Rotation of the ring withinthe chuck body is prevented by this in.

The chuck body may be made'of any desired size I adapted to accommodatethe grinding wheel proper, which is made of abrasive material and isadapted to fit loosely within the body. The grinding wheel is indicatedby reference character 15 in Fig. 1, this wheel being of full size andof the relative thickness of a new wheel. After the wheel has been worndown approximately to the outer edge of the body flange 6, it may beremoved and re-positioned, as shown in Fig. 2, the wheel being spacedfrom the disk 5 by a spacing ring 10, preferably of angular shape incross section to afford a surface of substantial area against which theinner face of the wheel may abut. When the grinding wheel has again beenworn down, a thicker spacing ring may be substituted for the ring 16,and in this manner practically the entire body of the grinding wheel maybe used up before a new wheel is required.

At regularly spaced intervals around its iii circumference, the bodyflange 6 is provided with tapped openings intersecting the groove 11,into each of which is threaded a set screw 16, and after the grindingwheel has been positioned in. the body, it is clamped therein bythreading these set screws inwardly against the clamping ring 14 so asto compress this ring into tight clamping engagement with the perimeterof the grinding wheel. It will be observed that this clamping ring underthe action of theset I screws 16, engages the periphery of the grindingwheel at substantially all points in its circumference so that the wheelis firmly clamped and held throughout its entire periphery insteadiofbeing gripped at a series of spaced intervals, as has heretofore beencustomary. The clamping ring, beingof substantial width, does notpenetrate the body of the wheel as a series of narrow clamping deviceswould, and consequently, the wheel cannot work loose, nor is there anytendency toward splitting of the wheel as the result of the clampingaction. When it becomes necessary to reset the wheel in the chuck or toreplace it by another, this can be readily accomplished by simplyloosening the set screws 16, whereupon the clamping ring will expandaway from the perimeter of the grinding wheel, permitting the wheel tobe removed and repositioned or replaced by another, as occasion mayrequire. It is believed that my invention, its construction, and 'modeof operation will .be understood from the foregoing without furtherdescription, and while I have shown and described a preferredembodimentthereof, it should be manifest that the details ofconstruction are capable of considerable modification and variationwithout departing from the spirit of the invention, as set forth in theappended claims.

I claim:

1. A grinding wheel chuck, comprising a body adapted to receive a'grinding wheel,

said body being provided with an internal groove, a split'ring disposedin said groove, and means acting on said ring for forcing the same intoclamping relation with the perimeter ofa grinding wheel disposed withinsaid body.

'2. A grinding wheel chuck, comprising a body including a peripheralaxially disposedflange provided with an internal. groove, a clampingring positioned in said groove,

and a pluralityof set screws carried by said body and adapted to forcesaid ring into clamping engagement with a grinding Wheel disposed withinsaid. body. t

13. A grindingwheel chuck, comprising a body including an axiallydisposed flange providediwith an internal groove, a split ring seated insaid groove, means for preventing rotation of said'ring relatively tothe body, and aseries of set screws arranged to act upon said ring.

i 4, The combination of a chuck body provided with an internal "groove,a clamping ring disposed in said groove, means for compressing saidclamping ring, a grinding wheel positioned within the body and ring, anda spacing'ring disposed between said grinding wheel and said body.

5. A grinding wheel chuck, comprising a body provided with an: annularflange adapted to surround a grinding wheel, a

compressible I ring interposed between said flange and the entireperiphery of said wheel,

